Even the smallest dose of power can change a person. You’ve probably seen it. Someone gets a promotion or a bit of fame and then, suddenly, they’re a little less friendly to the people beneath them.

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But if you ask Sukhvinder Obhi, a neuroscientist at Wilfrid Laurier University in Ontario, Canada, he might give you another explanation: Power fundamentally changes how the brain operates.

Obhi and his colleagues, Jeremy Hogeveen and Michael Inzlicht, have a new study showing evidence to support that claim.

Obhi and his fellow researchers randomly put participants in the mindset of feeling either powerful or powerless. They asked the powerless group to write a diary entry about a time they depended on others for help. The powerful group wrote entries about times they were calling the shots.